Is the Mining and Metallurgical Group a tiankeng enterprise? Why?

No. According to the official website of Zhiyouji, Mining and Metallurgy Group is a central enterprise under the management of the State-owned Assets Supervision and Administration Commission of the State Council. The company has a good atmosphere and does not promote involution and overtime culture. It is not a sinkhole enterprise, but a central enterprise with a good working atmosphere. Mining and Metallurgy Group, founded in 1956, is one of the first batch of innovative enterprises in the country. It is China's largest comprehensive research and design institution focusing on mining and metallurgy science and engineering technology.